Simplify more overqualified names

[GrahamTheCoder]

I've seen a slight tendency for the cs syntax generator to create overqualified types on fields/locals that don't get simplified.

Perhaps adding the simplifier annotation explicitly to this (and maybe as a general step at every level in the syntax tree) would give a better result.

[GrahamTheCoder]

Fixed between #386 and the recent work to ensure all types are present in the converted project before simplification